| <?xml version="1.0" encoding="utf-8"?> |
| <html xmlns="http://www.w3.org/1999/xhtml"> |
| <head> |
| <title>Canvas drag and drop: allowed effects 'copy','move','link'</title> |
| <style type="text/css"> |
| div |
| {display:inline-block; |
| vertical-align:top; |
| background-color:olive; |
| color:white; |
| padding:20px; |
| width:100px; |
| height:100px;} |
| div:nth-child(2) |
| {background-color:green;} |
| div:nth-child(3) |
| {background-color:teal;} |
| </style> |
| <script type="application/ecmascript"> |
| var effects = ['copy','move','link'], i = 0; |
| function dropSelection(event) |
| {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] && event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL ')); |
| i = (i + 1)%3;} |
| function start(event) |
| {event.dataTransfer.effectAllowed = effects[i]} |
| </script> |
| </head> |
| <body onload="selectText()"> |
| <p> |
| <canvas width="100" height="100" draggable="true" ondragstart="start(event)" ondragenter="event.preventDefault()" ondragover="return false" ondrop="addImage(event)">Canvas</canvas> |
| </p> |
| <div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/> |
| <div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/> |
| <div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/> |
| <p>You should be able to drag canvas pattern and drop it onto any of the green boxes.</p> |
| <script type="application/ecmascript"> |
| var canvas = document.querySelector('canvas'), |
| c = canvas.getContext('2d'); |
| for(var x = 0; x != 50; x++) |
| {c.fillStyle = (x%2 == 0)?'navy':'white'; |
| c.beginPath(); |
| c.moveTo(x,x); |
| c.lineTo(100-x,x); |
| c.lineTo(100-x,100-x); |
| c.lineTo(x,100-x); |
| c.closePath(); |
| c.fill();} |
| </script> |
| </body> |
| </html> |